How long until a Respiratory Infection is evident

How long (days, weeks, months?) before RSI becomes noticeable? Is it very quickly (a week or two) or does it take months in order for it to become evident that a snake has RSI?

I know that some illnesses can take quite a while and that it might be a gradual thing that develops slowly. Is this the case with RSI?

While I realize the plural of anecdote is not data, a few years ago I purchased two snakes from one vendor and one from a different vendor. All three started quarantine the same day and were outwardly healthy.

The two that came from the same vendor popped up with an RI at day 42 of quarantine, literally within 24 hours of each other. The one from the other vendor never did get sick. So now I quarantine for at least 90 days.